This year Frank spends an average of 70 minutes each night doing homework. This is 30 minutes less than twice the time he averaged last year. What was his average time last year?

2t - 30 = 70

what is t

50 sry

To find out Frank's average time doing homework last year, we can solve this problem using basic algebraic equations.

Let's assume the average time Frank spent doing homework last year is "x" minutes.

According to the problem:

This year, Frank spends an average of 70 minutes each night doing homework.
So, the average time this year is 70 minutes.

This is 30 minutes less than twice the time he averaged last year.
Twice the time Frank averaged last year can be expressed as 2*x.

Therefore, the equation becomes:

70 = 2x - 30

To solve for x, we need to isolate x on one side of the equation. Let's do the necessary calculations:

First, we add 30 to both sides of the equation to cancel out the negative 30:

70 + 30 = 2x
100 = 2x

Next, we divide both sides by 2 to solve for x:

100 / 2 = x
50 = x

Hence, Frank's average time doing homework last year was 50 minutes.